Table 1.

Values of n and σ ₃ for the group of participants from Parker et al. (2002), and for the 6 participants from the present experiment for the gain-control model. The value of n did not vary across stimulus sets. The values of σ ₃ in this table specify the standard deviation of the Laplace distributions when the stimulus set contained only four elements (three criteria). For stimulus sets containing five elements (four criteria), the value of the standard deviation of the Laplace distributions, σ ₄, was found to be 1.19 σ ₃. The value of dB_c in this model was 20.05, the value of s was 25.22, and the value of dB_T was 24.3

Experiment or Participant	Stimulus sets (Elements of the set are the intensity values of the tones in dB SPL)	n	σ 3
Parker et al. (2002)	{25, 30, 35, 40}, {25, 30, 35, 40, 45},	0.27	0.597
	{25, 30, 35, 40, 50}, {25, 30, 35, 40, 55},
	{25, 30, 35, 40, 60}, {25, 30, 35, 40, 70},
	{25, 30, 35, 40, 80}, {25, 30, 35, 40, 90},
	{84.5, 86.5, 88.5, 90.5}, {40, 84.5, 86.5, 88.5, 90.5},
	{50.5, 84.5, 86.5, 88.5, 90.5}, {60.5, 84.5, 86.5, 88.5, 90.5},
	{70.5, 84.5, 86.5, 88.5, 90.5}, {75.5, 84.5, 86.5, 88.5, 90.5},
	{80.5, 84.5, 86.5, 88.5, 90.5}, {82.5, 84.5, 86.5, 88.5, 90.5}
P1	{25, 30, 35, 40}, {25, 30, 35, 40, 50}, {25, 30, 35, 40, 80}	0.2	0.983
P2	{25, 30, 35, 40}, {25, 30, 35, 40, 50}, {25, 30, 35, 40, 80}	0.36	0.619
P3	{25, 30, 35, 40}, {25, 30, 35, 40, 50}, {25, 30, 35, 40, 80}	0.22	0.649
P4	{25, 30, 35, 40}, {25, 30, 35, 40, 50}, {25, 30, 35, 40, 80}	0.12	0.78
P5	{25, 30, 35, 40}, {25, 30, 35, 40, 50}, {25, 30, 35, 40, 80}	0.27	0.598
P6	{25, 30, 35, 40}, {25, 30, 35, 40, 50}, {25, 30, 35, 40, 80}	0.38	0.223